I have posted on other topic-boards here, but am trying to look for answers.

Here's a quick history:
I started to feel a strange mild pain near my lower left of my abdomen/torso in January. I had just had my yearly check-up, which was normal. I also began to experience more frequent urination. I saw my PCP and he referred me to urologist. I saw to urologists and both said everything was fine. But the lower left pain was still there. Nothing to ruin my day, but a feeling that something was there. I was referred to GI doc. I had a CT scan, which was negative. I felt like I had a mild fever at times during the day and now I was having mild night sweats. I had a colonoscopy, which was negative.

Finally, my blood pressure has been slightly high for a month. I am 39 and in excellent health (I run marathons) and have never experienced anything like this. The problem is not debilitating. I can still run, work and function normally. But the feeling in my side is there AND now it throbs. The perceived fever is there.

On Friday I went to emergency room because I felt like no one had done a complete battery of tests on me. Blood work, etc. The ER doc was excellent. But he couldn't find anything. The only thing out of the normal range was a slightly higher number on the pancreas with the blood count, but nothing to worry about, he said. And my elevated blood pressure.

What do I do now? I know my body and I know that something is wrong.
If something was really, really wrong (like cancer, etc.) they would have caught it by now, right? What should my next step be? Just live with it and worry or continue to try to find an answer? Go back to my PCP or move to another doc.

Any suggestions would help out tremendously.